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Annotation of 43BSDReno/usr.bin/des/des.1, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1989, 1990 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" This code is derived from software contributed to Berkeley by
        !             5: .\" Phil Karn, derived from original work by Jim Gillogly and
        !             6: .\" Richard Outerbridge.
        !             7: .\"
        !             8: .\" Redistribution and use in source and binary forms are permitted provided
        !             9: .\" that: (1) source distributions retain this entire copyright notice and
        !            10: .\" comment, and (2) distributions including binaries display the following
        !            11: .\" acknowledgement:  ``This product includes software developed by the
        !            12: .\" University of California, Berkeley and its contributors'' in the
        !            13: .\" documentation or other materials provided with the distribution and in
        !            14: .\" all advertising materials mentioning features or use of this software.
        !            15: .\" Neither the name of the University nor the names of its contributors may
        !            16: .\" be used to endorse or promote products derived from this software without
        !            17: .\" specific prior written permission.
        !            18: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21: .\"
        !            22: .\"     @(#)des.1      5.4 (Berkeley) 7/24/90
        !            23: .\"
        !            24: .Dd July 24, 1990
        !            25: .Dt DES 1
        !            26: .Os BSD 4.4
        !            27: .Sh NAME
        !            28: .Nm des
        !            29: .Nd DES file encryption
        !            30: .Sh SYNOPSIS
        !            31: .Pp
        !            32: .Nm Des
        !            33: .Fl e
        !            34: .Op bh
        !            35: .Op Fl k Ar key
        !            36: .Nm des
        !            37: .Fl f
        !            38: .Op bh
        !            39: .Op Fl k Ar key
        !            40: .Sh DESCRIPTION
        !            41: .Nm des
        !            42: is a filter that encrypts or decrypts standard input to standard output
        !            43: with the Data Encryption Standard (DES).
        !            44: .Pp
        !            45: Options:
        !            46: .Dw Ds
        !            47: .Di L
        !            48: .Dp Fl e
        !            49: (encrypt)
        !            50: .Dp Fl d
        !            51: (decrypt)
        !            52: .br
        !            53: Either
        !            54: .Fl e
        !            55: or
        !            56: .Fl d
        !            57: must be specified.
        !            58: .Pp
        !            59: .Dp Fl k
        !            60: If the key is not
        !            61: given on the command line with the
        !            62: .Fl k
        !            63: option the command will prompt for it
        !            64: twice, suppressing echo and comparing the two responses to guard against
        !            65: mistyping.
        !            66: .Pp
        !            67: .Dp Fl h
        !            68: The
        !            69: .Fl h
        !            70: flag controls how the key string is to be interpreted.
        !            71: Without the
        !            72: .Fl h
        !            73: flag, the key is an ASCII string.
        !            74: Since DES ignores the low
        !            75: order bit of each key byte, the
        !            76: high order bit is set for odd parity, thus retaining the information contained
        !            77: in the low order bit.
        !            78: If the
        !            79: .Fl h
        !            80: flag is set, the key string is interpreted as
        !            81: 16 hex/ASCII characters; the low order bit of each byte is again ignored as per
        !            82: the DES algorithm.
        !            83: This allows the use of any arbitrary 56-bit key, including bytes representing
        !            84: control characters that could not be typed if the -h option were not used.
        !            85: .Pp
        !            86: .Dp Fl b
        !            87: Electronic Code
        !            88: Book (ECB) mode is used.
        !            89: By default, DES Cipher Block Chaining (CBC) mode is used, with an initial
        !            90: vector (IV) of all zeros.
        !            91: .Pp
        !            92: Except for the
        !            93: .Fl h
        !            94: option, this command is compatible with the
        !            95: .Nm des
        !            96: command on the Sun Microsystems workstation.
        !            97: .Dp
        !            98: .Sh SEE ALSO
        !            99: Sun Microsystems DES(1) manual page,
        !           100: which describes in detail how
        !           101: the length of the file is encoded in the last block of ciphertext.
        !           102: .Sh AUTHOR
        !           103: Phil Karn, KA9Q
        !           104: .Sh HISTORY
        !           105: 4.3Reno BSD.

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